Designed for homeowners who want zoned heating and cooling without paying for professional installation, the MRCOOL DIY 5th Generation 24,000 BTU 2-Zone Mini-Split provides efficient, independent comfort in two separate rooms using a single outdoor condenser.
This system includes one 6,000 BTU and one 18,000 BTU wall-mounted indoor unit, along with factory pre-charged QuickConnect® line sets. This eliminates the need for vacuum pumps, refrigerant handling, or specialized HVAC tools. If you can handle basic tools and standard electrical connections, you can install this system yourself.
Each zone operates independently, allowing personalized temperature control in both spaces. With efficiency ratings up to 23.0 SEER2 and 9.9 HSPF2-4 heating performance, this system delivers serious energy savings while providing reliable heating performance down to -13°F for year-round comfort.
Ideal for rooms, offices, or living areas of varying sizes, this dual-zone mini split offers a simple way to condition up to 1,050 square feet total (Up to 250 sq. ft. + Up to 800 sq. ft.), backed by strong warranty coverage for long-term peace of mind.
Key Features
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True DIY Installation – No specialized tools or HVAC experience required. Pre-charged QuickConnect® line sets simplify setup.
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High Efficiency Performance – Up to 23.0 SEER2 and 9.9 HSPF2-4 for year-round comfort with energy savings.
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Smart Control Integration – Control each zone using included remotes, mobile app, or compatible smart assistants.
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Dual Independent Zones – One 6K and one 18K indoor unit provide independent temperature control tailored to each room's size.
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Cold Climate Heating – Reliable heating performance in outdoor temperatures as low as -13°F.
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Eco-Friendly Refrigerant – Factory charged with low-GWP R-454B refrigerant.
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Quiet Indoor Operation – Low sound levels ideal for bedrooms and living spaces.
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Auto Restart – Automatically restores previous settings after power outages.
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Backed by Industry-Leading Warranty – Includes 5-year parts warranty and 7-year compressor warranty.
Specifications
Overview
| Brand |
MRCOOL |
| Series |
DIY 5th Generation |
| System Type |
Dual-Zone Ductless Mini-Split Heat Pump |
System Overview
| Total Capacity |
24,000 BTU |
| Zones |
2 |
| Zone Output |
6,000 BTU + 18,000 BTU |
| Zone 1 Coverage |
Up to 250 sq. ft. |
| Zone 2 Coverage |
Up to 800 sq. ft. |
| Refrigerant Type |
R-454B (pre-charged) |
| Line Sets Included |
2 pre-charged QuickConnect® line sets |
| Mount Type |
Wall Mounted |
| Warranty Parts |
5 Years |
| Warranty Compressor |
7 Years |
Outdoor Unit (36K)
| Model |
DIY-MULTI5-36HP230D-O |
| Cooling Capacity |
34,000 BTU |
| Heating Capacity |
36,000 BTU |
| SEER2 |
23.0 |
| EER2 |
12.0 |
| HSPF2-4 |
9.9 |
| HSPF2-5 |
7.5 |
| Cooling Operating Range |
-13°F – 122°F |
| Heating Operating Range |
-13°F – 75°F |
| Voltage |
208–230V |
| Phase |
1 |
| Frequency |
60 Hz |
| Minimum Circuit Ampacity |
30.5A |
| Maximum Breaker Size |
35.0A |
| Outdoor Sound Level |
64.0 dB(A) |
| Dimensions |
37.24" W x 16.14" D x 31.89" H |
| Weight |
169.75 lbs |
| Certifications |
ENERGY STAR Certified, AHRI Certified, UL Listed, ETL Listed |
Indoor Unit (6K) x 1
| Model |
DIY-06-HP-WMAH-230D25-O |
| Cooling Capacity |
6,000 BTU |
| Heating Capacity |
6,000 BTU |
| Coverage Area |
Up to 250 sq. ft. |
| Liquid Line Size |
1/4" |
| Suction Line Size |
3/8" |
| Modes |
Auto, Cool, Heat, Fan Only, Dry, Sleep |
| Dimensions |
31.57" W x 7.44" D x 11.69" H |
| Weight |
24.47 lbs |
Indoor Unit (18K) x 1
| Model |
DIY-18-HP-WMAH-230D25-O |
| Cooling Capacity |
18,000 BTU |
| Heating Capacity |
18,000 BTU |
| Coverage Area |
Up to 800 sq. ft. |
| Liquid Line Size |
1/4" |
| Suction Line Size |
1/2" |
| Modes |
Auto, Cool, Heat, Fan Only, Dry, Sleep |
| Dimensions |
42.52" W x 8.9" D x 13.19" H |
| Weight |
35.49 lbs |
BTU Size Chart
Which BTU rating should I choose?
- The appropriate BTU rating depends on the size of the space you need to heat or cool.
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A higher BTU indicates greater heating and cooling capacity, allowing the air handler to effectively condition larger areas.
| Air Handler BTU |
Coverage Area/Room Size(Sq.Ft.)* |
| 9K |
Up to 400 Sq.Ft. |
| 12K |
Up to 550 Sq.Ft. |
| 18K |
Up to 800 Sq.Ft. |
| 24K |
Up to 1050 Sq.Ft. |
| 36K |
Up to 1,550 Sq.Ft. |
*Ceiling height, insulation quality, and local climate can all affect the actual coverage area. For instance, an uninsulated space will need more BTUs to maintain comfort compared to a well-insulated room.
Shipping & Returns
Shipping Policy
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Free Shipping on All Orders – We provide free standard delivery on all orders within the contiguous U.S.
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Ground Shipping for Smaller Items – Accessories and lighter products ship via standard ground carriers such as FedEx, UPS, or similar.
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Freight Delivery – Large items (HVAC/Heaters) ship via LTL freight. Drivers deliver to the curbside only; they cannot bring items into your home or garage.
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Tracking Information – Tracking is typically provided within 1 business day once your order ships.
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Carrier Updates – Once tracking is issued, allow 1–2 business days for the carrier to populate shipment details.
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More Information – Full details can be found on our Shipping Policy page.
Return Policy
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30-Day Return Window – Return requests must be submitted within 30 days of delivery; requests after this period cannot be accepted.
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Inspect Upon Delivery – Visible damage must be noted on the driver's paperwork. Report all damage within 24 hours to qualify for a replacement.
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Return Condition Requirements – Items must be unused, uninstalled, and in original packaging, including all boxes, crates, or pallets.
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Restocking Fees – Restocking fees of 25–35% apply to most brands; see full policy for details.
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Non-Returnable Items – Accessories, small components (remotes, line sets), and custom-finish items are non-returnable.
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Full Details – See our Return & Refund Policy page for complete guidelines.
